Enabling clcache overrides the local property-sheets

[AquilaRapax]

Enabling clcache with python main.py enable overrides the local Microsoft property sheets in "AppData\Local\Microsoft\MSBuild\v4.0" instead of just inserting it's keys (CLToolExe and CLToolPath). And since the tool did no backup of these files, disabling the tool again left me with empty property sheets.
Since i used those property files for myself, my changes were gone after the process. So i would suggest to just insert the Keys and evetually make a backup of the original files.